I think having a mandatory auction + proceeds rebate system is better and then whoever holds it can write indefinite contracts/licences.
For example, imagine you get 100% rebate of auction proceeds untill year 5, then it drops 1% per year:
- at year 5 it's nearly impossible to do a hostile accquisition because you have a 100x advantage and only lose 1% of highest or second highest if it's a blind auctio.
- by year 25 you have to pony up up to 20% FMV per year just to retain monopoly. And only have a 5x advantage vs a competing bidder.
- the remaining fraction if paid back to consumers as basic income, can be thought of as a
- losing an auction doesn't hurt your buisness operation if you wrote yourself a perpetual contract
- auction loser is compensated less every year the contract ages and therefore has strong incentive to sublicense
- government and trade groups can buy out key patents at fair prices
- defensive patent pools still work, trolling is riskier